package cn.lili.common.utils;

import lombok.extern.slf4j.Slf4j;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * IpUtils
 *
 * @author Chopper
 * @version v1.0 2020-12-08 15:32
 */
@Slf4j
public class IpUtils {

	/**
	 * 获取本机IP
	 *
	 * @return ip
	 */
	public static String getLocalIp() {
		try {
			return InetAddress.getLocalHost().getHostAddress();
		} catch (UnknownHostException e) {
			log.error("获取本机IP错误", e);
			return null;
		}
	}

	/**
	 * 获取客户端IP地址
	 *
	 * @param request
	 *            请求
	 * @return
	 */
	public static String getIpAddress(HttpServletRequest request) {

		String ip = request.getHeader("x-forwarded-for");
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
		}
		// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
		if (ip != null && ip.length() > 15) {
			if (ip.indexOf(",") > 0) {
				ip = ip.substring(0, ip.indexOf(","));
			}
		}
		if ("0:0:0:0:0:0:0:1".equals(ip)) {
			ip = "127.0.0.1";
		}
		return ip;
	}

	public static void main(String[] args) {
		System.out.println(IpUtils.getLocalIp());
	}
}
